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20100901
20100930
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. no records of such calls. diana avillar tells us there were other signs of trouble. >> reporter: this is exhibit a in the ntsb's investigation. the 28-foot long pipeline at the center of the san bruno explosion. >> we want to know, was it a fatigue factor associated with pressurizing and depreciatizing the pipe which could eventually break it. >> reporter: now comes information the pipeline was known to be potentially dangerous. in a 2007 document the owner, pg & e said the pipeline ranks in the top 100 risks of and risk of failure at this location is unacceptably high. the document was part of a budget request to replace the line. monday pg & e refute the their own report. they said the line had been tested as recently as this march. >> this one not listed as one of the high-risk sections of the pipeline. >> reporter: the california public utilities commission ordered the company to inspect all 6,400 miles of existing pipeline, that run directly beneath homes. crumbling infrastructure is not just california's problem. according to the agency overseeing the nation's pipelines,
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